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Bacterial communities and potential waterborne pathogens within the typical urban surface waters | Scientific Reports

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However, little is known about the pathogenic microorganisms in urban water systems. In this study, the bacterial community structure of 16 typical surface waters in the city of Beijing were analyzed using Illumina MiSeq high-throughput sequencing based on 16S rRNA gene. The results showed that Bacteroidetes, Proteobacteria and Actinobacteria were the dominant groups in 16 surface water samples, and Betaproteobacteria, Alphaproteobacteria, Flavobacteriia, Sphingobacteriia and Actinobacteria were the most dominant classes. The dominant genus across all samples was Flavobacterium. In addition, fifteen genus level groups of potentialy pathogenic bacteria were detected within the 16 water samples, with Pseudomonas and Aeromonas the most frequently identified. Spearman correlation analysis demonstrated that richness estimators (OTUs and Chao1) were correlated with water temperature, nitrate and total nitrogen (p < 0.05), while ammonia-nitrogen and total nitrogen were significantly correlated with the percent of total potential pathogens (p ≤ 0.05). 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Chinese Academy of Sciences, Beijing, China","@type":"PostalAddress"},"@type":"Organization"},{"name":"University of Chinese Academy of Sciences","address":{"name":"College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China","@type":"PostalAddress"},"@type":"Organization"}],"email":"yedeng@rcees.ac.cn","@type":"Person"}],"isAccessibleForFree":true,"@type":"ScholarlyArticle"},"@context":"https://schema.org","@type":"WebPage"}</script> <link rel="canonical" href="https://www.nature.com/articles/s41598-018-31706-w"> <meta name="journal_id" content="41598"/> <meta name="dc.title" content="Bacterial communities and potential waterborne pathogens within the typical urban surface waters"/> <meta name="dc.source" content="Scientific Reports 2018 8:1"/> <meta name="dc.format" content="text/html"/> <meta name="dc.publisher" content="Nature Publishing Group"/> <meta name="dc.date" content="2018-09-06"/> <meta name="dc.type" content="OriginalPaper"/> <meta 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</div> <div class="c-article-header"> <header> <ul class="c-article-identifiers" data-test="article-identifier"> <li class="c-article-identifiers__item" data-test="article-category">Article</li> <li class="c-article-identifiers__item"> <a href="https://www.springernature.com/gp/open-research/about/the-fundamentals-of-open-access-and-open-research" data-track="click" data-track-action="open access" data-track-label="link" class="u-color-open-access" data-test="open-access">Open access</a> </li> <li class="c-article-identifiers__item">Published: <time datetime="2018-09-06">06 September 2018</time></li> </ul> <h1 class="c-article-title" data-test="article-title" data-article-title="">Bacterial communities and potential waterborne pathogens within the typical urban surface waters</h1> <ul class="c-article-author-list c-article-author-list--short" data-test="authors-list" data-component-authors-activator="authors-list"><li class="c-article-author-list__item"><a data-test="author-name" data-track="click" data-track-action="open author" data-track-label="link" href="#auth-Decai-Jin-Aff1-Aff2" data-author-popup="auth-Decai-Jin-Aff1-Aff2" data-author-search="Jin, Decai" data-corresp-id="c1">Decai Jin<svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-mail-medium"></use></svg></a><sup class="u-js-hide"><a href="#Aff1">1</a>,<a href="#Aff2">2</a></sup>, </li><li class="c-article-author-list__item"><a data-test="author-name" data-track="click" data-track-action="open author" data-track-label="link" href="#auth-Xiao-Kong-Aff1-Aff2" data-author-popup="auth-Xiao-Kong-Aff1-Aff2" data-author-search="Kong, Xiao">Xiao Kong</a><sup class="u-js-hide"><a href="#Aff1">1</a>,<a href="#Aff2">2</a></sup>, </li><li class="c-article-author-list__item c-article-author-list__item--hide-small-screen"><a data-test="author-name" data-track="click" data-track-action="open author" data-track-label="link" href="#auth-Bingjian-Cui-Aff1-Aff2" data-author-popup="auth-Bingjian-Cui-Aff1-Aff2" data-author-search="Cui, Bingjian">Bingjian Cui</a><sup class="u-js-hide"><a href="#Aff1">1</a>,<a href="#Aff2">2</a></sup>, </li><li class="c-article-author-list__item c-article-author-list__item--hide-small-screen"><a data-test="author-name" data-track="click" data-track-action="open author" data-track-label="link" href="#auth-Shulan-Jin-Aff3" data-author-popup="auth-Shulan-Jin-Aff3" data-author-search="Jin, Shulan">Shulan Jin</a><sup class="u-js-hide"><a href="#Aff3">3</a></sup>, </li><li class="c-article-author-list__item c-article-author-list__item--hide-small-screen"><a data-test="author-name" data-track="click" data-track-action="open author" data-track-label="link" href="#auth-Yunfeng-Xie-Aff4" data-author-popup="auth-Yunfeng-Xie-Aff4" data-author-search="Xie, Yunfeng">Yunfeng Xie</a><sup class="u-js-hide"><a href="#Aff4">4</a></sup>, </li><li 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class="u-js-hide">  <a class="js-orcid" href="http://orcid.org/0000-0002-7584-0632"><span class="u-visually-hidden">ORCID: </span>orcid.org/0000-0002-7584-0632</a></span><sup class="u-js-hide"><a href="#Aff1">1</a>,<a href="#Aff2">2</a></sup> </li></ul><button aria-expanded="false" class="c-article-author-list__button"><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-down-medium"></use></svg><span>Show authors</span></button> <p class="c-article-info-details" data-container-section="info"> <a data-test="journal-link" href="/srep" data-track="click" data-track-action="journal homepage" data-track-category="article body" data-track-label="link"><i data-test="journal-title">Scientific Reports</i></a> <b data-test="journal-volume"><span class="u-visually-hidden">volume</span> 8</b>, Article number: <span data-test="article-number">13368</span> (<span data-test="article-publication-year">2018</span>) <a href="#citeas" class="c-article-info-details__cite-as u-hide-print" data-track="click" data-track-action="cite this article" data-track-label="link">Cite this article</a> </p> <div class="c-article-metrics-bar__wrapper u-clear-both"> <ul class="c-article-metrics-bar u-list-reset"> <li class=" c-article-metrics-bar__item" data-test="access-count"> <p class="c-article-metrics-bar__count">7856 <span class="c-article-metrics-bar__label">Accesses</span></p> </li> <li class="c-article-metrics-bar__item" data-test="citation-count"> <p class="c-article-metrics-bar__count">56 <span class="c-article-metrics-bar__label">Citations</span></p> </li> <li class="c-article-metrics-bar__item" data-test="altmetric-score"> <p class="c-article-metrics-bar__count">2 <span class="c-article-metrics-bar__label">Altmetric</span></p> </li> <li class="c-article-metrics-bar__item"> <p class="c-article-metrics-bar__details"><a href="/articles/s41598-018-31706-w/metrics" data-track="click" data-track-action="view metrics" data-track-label="link" rel="nofollow">Metrics <span class="u-visually-hidden">details</span></a></p> </li> </ul> </div> </header> <div class="u-js-hide" data-component="article-subject-links"> <h3 class="c-article__sub-heading">Subjects</h3> <ul class="c-article-subject-list"> <li class="c-article-subject-list__subject"><a href="/subjects/environmental-economics" data-track="click" data-track-action="view subject" data-track-label="link">Environmental economics</a></li><li class="c-article-subject-list__subject"><a href="/subjects/environmental-impact" data-track="click" data-track-action="view subject" data-track-label="link">Environmental impact</a></li> </ul> </div> </div> <div class="c-article-body"> <section aria-labelledby="Abs1" data-title="Abstract" lang="en"><div class="c-article-section" id="Abs1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Abs1">Abstract</h2><div class="c-article-section__content" id="Abs1-content"><p>Waterborne pathogens have attracted a great deal of attention in the public health sector over the last several decades. However, little is known about the pathogenic microorganisms in urban water systems. In this study, the bacterial community structure of 16 typical surface waters in the city of Beijing were analyzed using Illumina MiSeq high-throughput sequencing based on 16S rRNA gene. The results showed that Bacteroidetes, Proteobacteria and Actinobacteria were the dominant groups in 16 surface water samples, and Betaproteobacteria, Alphaproteobacteria, Flavobacteriia, Sphingobacteriia and Actinobacteria were the most dominant classes. The dominant genus across all samples was <i>Flavobacterium</i>. In addition, fifteen genus level groups of potentialy pathogenic bacteria were detected within the 16 water samples, with <i>Pseudomonas</i> and <i>Aeromonas</i> the most frequently identified. Spearman correlation analysis demonstrated that richness estimators (OTUs and Chao1) were correlated with water temperature, nitrate and total nitrogen (<i>p</i> &lt; 0.05), while ammonia-nitrogen and total nitrogen were significantly correlated with the percent of total potential pathogens (<i>p</i> ≤ 0.05). These results could provide insight into the ecological function and health risks of surface water bacterial communities during the process of urbanization.</p></div></div></section> <noscript> </noscript> <section aria-labelledby="inline-recommendations" data-title="Inline Recommendations" class="c-article-recommendations" data-track-component="inline-recommendations"> <h3 class="c-article-recommendations-title" id="inline-recommendations">Similar content being viewed by others</h3> <div class="c-article-recommendations-list"> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1038%2Fs41598-022-09579-x/MediaObjects/41598_2022_9579_Fig1_HTML.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://www.nature.com/articles/s41598-022-09579-x?fromPaywallRec=false" data-track="select_recommendations_1" data-track-context="inline recommendations" data-track-action="click recommendations inline - 1" data-track-label="10.1038/s41598-022-09579-x">Insight into impact of sewage discharge on microbial dynamics and pathogenicity in river ecosystem </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__access-type">Open access</span> <span class="c-article-meta-recommendations__date">27 April 2022</span> </div> </div> </article> </div> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1038%2Fs41598-020-66386-y/MediaObjects/41598_2020_66386_Fig1_HTML.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://www.nature.com/articles/s41598-020-66386-y?fromPaywallRec=false" data-track="select_recommendations_2" data-track-context="inline recommendations" data-track-action="click recommendations inline - 2" data-track-label="10.1038/s41598-020-66386-y">Bacterial community composition and potential pathogens along the Pinheiros River in the southeast of Brazil </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__access-type">Open access</span> <span class="c-article-meta-recommendations__date">09 June 2020</span> </div> </div> </article> </div> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1038%2Fs41598-022-22642-x/MediaObjects/41598_2022_22642_Fig1_HTML.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://www.nature.com/articles/s41598-022-22642-x?fromPaywallRec=false" data-track="select_recommendations_3" data-track-context="inline recommendations" data-track-action="click recommendations inline - 3" data-track-label="10.1038/s41598-022-22642-x">Anthropogenic pollution gradient along a mountain river affects bacterial community composition and genera with potential pathogenic species </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__access-type">Open access</span> <span class="c-article-meta-recommendations__date">28 October 2022</span> </div> </div> </article> </div> </div> </section> <script> window.dataLayer = window.dataLayer || []; window.dataLayer.push({ recommendations: { recommender: 'semantic', model: 'specter', policy_id: 'NA', timestamp: 1732962211, embedded_user: 'null' } }); </script> <div class="main-content"> <section data-title="Introduction"><div class="c-article-section" id="Sec1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec1">Introduction</h2><div class="c-article-section__content" id="Sec1-content"><p>Surface freshwater ecosystems including lakes, rivers and streams, play an important role in the recycling of nutrients, biogeochemical cycling, and energy flows. In these ecosystems a diverse range of microorganisms play critical roles in the functioning of these cycles, which is associated with physicochemical parameters of water<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="Wu, C. et al. Characterization of coastal urban watershed bacterial communities leads to alternative community-based indicators. PLoS ONE 5, e11285 (2010)." href="/articles/s41598-018-31706-w#ref-CR1" id="ref-link-section-d86176811e444">1</a></sup>. In addition, the use of surface water for human recreation and consumption has increased with the pace and extent of urbanization, making microbial analysis of these water resources an essential part of water quality and human health.</p><p>A number of investigations into surface water microbial diversity have been performed<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2" title="Ibekwe, A. M., Leddy, M. B., Bold, R. M. &amp; Graves, A. K. Bacterial community composition in low-flowing river water with different sources of pollutants. FEMS Microbiol Ecol 79, 155–166 (2012)." href="/articles/s41598-018-31706-w#ref-CR2" id="ref-link-section-d86176811e451">2</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="Bryant, J. A. et al. Wind and sunlight shape microbial diversity in surface waters of the North Pacific Subtropical Gyre. ISME J 10, 1308–1322 (2016)." href="/articles/s41598-018-31706-w#ref-CR3" id="ref-link-section-d86176811e454">3</a></sup>. However, the microbial communities inhabiting urban surface waters are still relatively unknown. Beijing, as one of the largest cities in China, with a population of over 20 million, contains a number of surface water ecosystems, including river, reservoir, stream and lakes, all of which are closely tied to people’s lives. A better understanding of the scale spatial characteristics of microbial population (distribution, abundance and structure, etc.). The influence of environmental factors is essential to understanding the microbial processes underlying the urban surface ecosystem and is of particular importance to water management and public health. In previous studies, Araya <i>et al</i>. studied bacterial community composition in an urban river using fluorescent <i>in situ</i> hybridization (FISH) and denaturing gradient gel electrophoresis (DGGE), and showed that stream water was dominated by <i>β</i>-Proteobacteria and the Cytophaga-Flavobacterium cluster<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="Araya, R., Tani, K., Takagi, T., Yamaguchi, N. &amp; Nasu, M. Bacterial activity and community composition in stream water and biofilm from an urban river determined by fluorescent in situ hybridization and DGGE analysis. FEMS Microbiol Ecol 43, 111–119 (2003)." href="/articles/s41598-018-31706-w#ref-CR4" id="ref-link-section-d86176811e467">4</a></sup>. Zhang <i>et al</i>. investigated the bacterial community structure of surface water in three rivers located in the city of Shanghai over a one-year period using DGGE, showing that temperature was the major driver of bacterial community composition<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 5" title="Zhang, M. L. et al. Structure and seasonal dynamics of bacterial communities in three urban rivers in China. Aquat Sci 74, 113–120 (2012)." href="/articles/s41598-018-31706-w#ref-CR5" id="ref-link-section-d86176811e475">5</a></sup>. Unfortunately, water microbial communities are particularly difficult to study by traditional PCR-cloning based approaches (DGGE, clone library and FISH, etc.). Recently developed high-throughput next-generation sequencing methods, such as MiSeq pyrosequencing of the 16S rRNA gene, have provided more comprehensive descriptions of bacterial communities in various environments due to the increased number of sequence reads that can be obtained. However, there is very little published research on bacterial diversity and community composition of the surface waters in Beijing. In 2015, Wei <i>et al</i>. reported the core microbial community from five surface water samples was composed of 13 phyla and 40 genera<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="Wei, Y. M. et al. Bacterial communities of Beijing surface waters as revealed by 454 pyrosequencing of the 16S rRNA gene. Environ Sci Pollut Res 22, 12605–12614 (2015)." href="/articles/s41598-018-31706-w#ref-CR6" id="ref-link-section-d86176811e482">6</a></sup>. However, their correlation with physical and chemical factors in the environment remains unknown.</p><p>The objective of this study was to examine and compare the microbial diversity and abundance of sixteen surface waters in Beijing, using the Illumina MiSeq system. Meanwhile, multivariate statistical analysis was also performed to evaluate the relationships between microbial communities and environmental factors. Furthermore, the presence of potential pathogens in these water samples was also evaluated. Our results provide more detailed information on the characteristics of urban surface water microbial communities, as well as for risk management of potential bacterial pathogens in urban surface waters.</p></div></div></section><section data-title="Results"><div class="c-article-section" id="Sec2-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec2">Results</h2><div class="c-article-section__content" id="Sec2-content"><h3 class="c-article__sub-heading" id="Sec3">Physicochemical characteristics of 16 surface water samples</h3><p>The temperature of sampling sites ranged from 9.0 to 25.0 °C with an average of 17.65 °C. Plate counts showed the highest concentrations of total bacteria were in sample HL (3.83 × 10<sup>6</sup> CFU/mL), which also exhibited the highest turbidity value, followed by sample QR and GBD, with the values of 3.0 × 10<sup>4</sup> and 2.8 × 10<sup>4</sup> CFU/mL, respectively, while sample MY contained the lowest number (3.0 × 10<sup>2</sup> CFU/mL). The highest conductivity was found in sample QR. Total nitrogen ranged from 1.38 to 19.0 mg/L and nitrate-nitrogen from 0.8 to 17.3 mg/L. The highest of total phosphorus was observed in sample HL, and the lowest in sample CQ. The properties of 16 surface water samples are listed in Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="/articles/s41598-018-31706-w#Tab1">1</a>.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-1"><figure><figcaption class="c-article-table__figcaption"><b id="Tab1" data-test="table-caption">Table 1 Physical and chemical properties of the 16 surface water samples.</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/articles/s41598-018-31706-w/tables/1" aria-label="Full size table 1"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec4">Diversity analysis using operational taxonomic units</h3><p>In total, Illumina MiSeq sequencing generated clean reads of 585,728 high quality 16S rRNA gene sequences with an average of 36,608 sequences per sample. After trimming, alignment, and chimera removal using the standard operating procedure for Mothur, the number of sequences of each sample ranged from 17,519 (QR) to 36,002 (WY). All samples were randomly resampled to 17,519 sequences, with 280,304 rarefied sequences for the 16 samples retained and were subjected to further statistical analyses.</p><p>Biodiversity of the 16 surface water samples was investigated by analyzing OTUs, Chao1, and Shannon indices at cut-off levels of 3% (Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="/articles/s41598-018-31706-w#Tab2">2</a>). Slight differences in biodiversity were observed among the different sites. For example, the library derived from sampling site CQ had the greatest number of OTUs (1,483), followed by sample GBD (1,424) and QR (1,406), while sample ZGC had the smallest (393). Chao1 numbers were considerably higher than OTU numbers, suggesting that more OTUs may exist in these bacterial communities. However, the Good’s coverage value of all samples was above 95.14%, suggesting that the observed sequences could function as a good representation of the bacterial communities present in the 16 samples. Additionally, the Shannon diversity index was also generated for each sample, with the results supporting that sample CQ had the highest bacterial diversity of the 16 samples.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-2"><figure><figcaption class="c-article-table__figcaption"><b id="Tab2" data-test="table-caption">Table 2 Diversity indices from 16 surface water samples.</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/articles/s41598-018-31706-w/tables/2" aria-label="Full size table 2"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>In order to test the interaction between biodiversity indices and water quality indices, Spearman’s rank correlation was calculated to compare the correlation between diversity indices (OTUs, Chao1 and Shannon diversity index) and water temperature as well as other qualitative parameters. As indicated by Spearman’s rank correlation, water temperature, nitrate, and TN had significant correlations (<i>p</i> &lt; 0.05) with OTUs and Chao1 (Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="/articles/s41598-018-31706-w#Tab3">3</a>). Among all the water quality indices, only the TN was significantly positively correlated with Chao1 at <i>p</i> ≤ 0.01 level. It should be noted that no significant correlation was found between Shannon index and any water physicochemical parameter.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-3"><figure><figcaption class="c-article-table__figcaption"><b id="Tab3" data-test="table-caption">Table 3 Correlation between the alpha diversity and water quality indexes.</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/articles/s41598-018-31706-w/tables/3" aria-label="Full size table 3"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec5">Taxonomic distributions among samples</h3><p>Surface water OTUs were classified to 43 bacterial phyla the most predominant phyla being Proteobacteria, Bacteroidetes and Actinobacteria. Based on relative abundances, the dominant groups (greater than 1% abundance) of each sample are displayed in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig1">1</a>. As shown, Proteobacteria and Bacteroidetes were the most commonly detected phyla in all the samples, accounting for 21.9–78.5% and 19.1–74.7% of sequences, respectively. The sample QR contained the most Proteobacteria (78.5%), while sample ZGC contained the most Bacteroidetes (74.7%). At the class level, the dominant groups for the 16 water samples varied. For instance, Betaproteobacteria were dominant in the majority of water samples including BJ, GBD, HR, NT, QH, QL, QR, RM, WY and YX, while in samples HL, NH, YD and ZGC, Flavobacteriia were the dominant group. It should be noted that only sample CQ was dominated by the Actinobacteria class, and Sphingobacteriia was dominant in only sample MY. Of the 16 samples, only in MY were there OTUs (2.97%) that could not be assigned to any known, which may indicate a novel uncharacterized phylum present at that site.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-1" data-title="Figure 1"><figure><figcaption><b id="Fig1" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 1</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/1" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig1_HTML.png?as=webp"><img aria-describedby="Fig1" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig1_HTML.png" alt="figure 1" loading="lazy" width="685" height="425"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-1-desc"><p>Bacterial community compositions at the phylum level as revealed by MiSeq sequencing. Phyla making up less than 1% of total composition were classified as “others” in the 16 samples.</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/1" data-track-dest="link:Figure1 Full size image" aria-label="Full size image figure 1" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>The abundance of the top 30 genera are shown in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig2">2</a>. The most predominant genera among Proteobacterial sequences were <i>unclassified_Comamonadaceae, Limnohabitans, Polynucleobacter, Rhodoferax, Hydrogenophaga, Candidatus_Aquirestis</i> and <i>Polaromonas. Flavobacterium</i> was the predominant Bacteroidetes genus and was the most predominant genus in 12 of 16 surface water samples. The exceptions being CQ, GBD, QR and WY.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-2" data-title="Figure 2"><figure><figcaption><b id="Fig2" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 2</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/2" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig2_HTML.png?as=webp"><img aria-describedby="Fig2" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig2_HTML.png" alt="figure 2" loading="lazy" width="685" height="735"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-2-desc"><p>Heat map of the top 30 genera present in the sixteen surface water samples.</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/2" data-track-dest="link:Figure2 Full size image" aria-label="Full size image figure 2" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>Principal coordinate analysis was used to analyze the bacterial community dissimilarity. As shown in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig3">3</a>, significant differences in bacterial community composition were found among most samples. However, similar patterns of bacterial community composition were observed for few samples, as exemplified by samples MY and RM.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-3" data-title="Figure 3"><figure><figcaption><b id="Fig3" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 3</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/3" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig3_HTML.png?as=webp"><img aria-describedby="Fig3" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig3_HTML.png" alt="figure 3" loading="lazy" width="685" height="566"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-3-desc"><p>The plots of principal coordinate analysis illustrating community dissimilarities based on weighted UniFrac distances metric.</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/3" data-track-dest="link:Figure3 Full size image" aria-label="Full size image figure 3" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>To test possible linkages between the microbial communities and surface water quality parameters, canonical correspondence analysis (CCA) was performed (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig4">4</a>) and the results showed that bacterial community composition was significantly correlated to turbidity (<i>r</i><sup>2</sup> = 0.56; <i>p</i> = 0.01). CCA axis 1 was positively correlated with water temperature, pH, EC, nitrate, chloride, turbidity, AN, TP and TN, but was negatively correlated with TB. The first CCA dimension explained 8.51% of the variation of bacterial communities, and the second explained 8.42%.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-4" data-title="Figure 4"><figure><figcaption><b id="Fig4" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 4</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/4" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig4_HTML.png?as=webp"><img aria-describedby="Fig4" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig4_HTML.png" alt="figure 4" loading="lazy" width="685" height="549"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-4-desc"><p>Canonical correspondence analysis (CCA) biplot of bacterial communities and environmental parameters.</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/4" data-track-dest="link:Figure4 Full size image" aria-label="Full size image figure 4" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading" id="Sec6">Detection of potential waterborne pathogens</h3><p>Of the 66 potential waterborne pathogens recommend by USA EPA<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="USEPA. Workshop on Emerging Infectious Disease Agents and Associated with Animal Manures, Biosolids and Other Similar By-products USEPA National Risk Management Research Laboratory, Cincinnati, OH. (2001)." href="/articles/s41598-018-31706-w#ref-CR7" id="ref-link-section-d86176811e2728">7</a></sup>, a total of 15 were detected across all of the samples. Only two types of potential pathogenic bacteria were found in sample ZGC, while 12 were detected in sample NH, the most of any sample. However, the greatest abundance of potential waterborne pathogens was observed in sample QR, accounting for 10.39% of all the OTUs, followed by sample HL (5.33%), QL (3.85%), GBD (1.94%), NH (1.26%), WY (1.34%), YX (1.07%), MY (0.96%), RM (0.94%), NT (0.80%), HR (0.56%), CQ (0.43%), YD (0.43%), QH (0.31%), BJ (0.23%) and ZGC (0.11%). At the phylum level, Proteobacteria contributed the highest proportion of bacterial richness that may be caused diseases in humans, accounting for 24.48–100% in all the potential pathogenic bacteria composition. The next most dominant phylum was the Firmicutes, followed by Actinobacteria, Spirochaetae and Tenericutes. The distribution of potential pathogenic bacteria at genus level is shown in Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig5">5</a>.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-5" data-title="Figure 5"><figure><figcaption><b id="Fig5" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 5</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/5" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig5_HTML.png?as=webp"><img aria-describedby="Fig5" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig5_HTML.png" alt="figure 5" loading="lazy" width="685" height="401"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-5-desc"><p>Potential pathogenic bacteria diversity and abundance at genus level in total pathogen.</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/5" data-track-dest="link:Figure5 Full size image" aria-label="Full size image figure 5" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><p>Among the potential bacterial pathogens, the genus <i>Pseudomonas</i> was dominant in all the samples expect for sample YD, which was dominated by the genus <i>Mycobacterium</i>. The next most dominant flora in each sample was different. For instance, <i>Aeromonas</i> was the second richest genus of potential pathogenic bacteria in samples CQ, GBD, HL, NT, QH, QL and YX. While in samples NH, QR, RM and WY, <i>Arcobacter</i> was the second most abundant genus of potential pathogenic bacteria among all the OTUs. Additionally, the relationship between water parameters and the percent of total potential pathogens was assessed using Spearman correlation coefficient analysis (Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="/articles/s41598-018-31706-w#Tab4">4</a>). The results indicated that both AN and TN were significantly correlated with the percent of total potential pathogens (<i>p</i> ≤ 0.05). No significant links were found between the percent of total potential pathogens and the remaining water parameters.</p><div class="c-article-table" data-test="inline-table" data-container-section="table" id="table-4"><figure><figcaption class="c-article-table__figcaption"><b id="Tab4" data-test="table-caption">Table 4 The Spearman correlation coefficients between total pathogen percent (%) and water quality indexes.</b></figcaption><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="table-link" data-track="click" data-track-action="view table" data-track-label="button" rel="nofollow" href="/articles/s41598-018-31706-w/tables/4" aria-label="Full size table 4"><span>Full size table</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div></div></div></section><section data-title="Discussion"><div class="c-article-section" id="Sec7-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec7">Discussion</h2><div class="c-article-section__content" id="Sec7-content"><p>Surface water, which consists of both natural and man-made water bodies (rivers, lakes, reservoirs, wetlands, parks, etc.) plays a vital role in urban ecosystem services<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="Rietveld, L. C. et al. Improving health in cities through systems approaches for urban water management. Environ Health 15(Suppl 1), 31 (2016)." href="/articles/s41598-018-31706-w#ref-CR8" id="ref-link-section-d86176811e2965">8</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 9" title="Garcia, X. et al. Placing ecosystem services at the heart of urban water systems management. Sci Total Environ 563–564, 1078–1085 (2016)." href="/articles/s41598-018-31706-w#ref-CR9" id="ref-link-section-d86176811e2968">9</a></sup>, and remains an important source for drinking water, irrigation, and recreation, etc. Changes in urban surface water may result in fluctuation of microbial community, with consequences to water quality and water-borne pathogen contamination. Assessing and understanding the microbial ecology of urban surface water from different regions is essential for making water quality management plans. In our study, high-throughput amplicon sequencing was used to characterize bacterial community structure and diversity of 16 surface water samples collected from various locations in the city of Beijing. The total number of phyla in each of the 16 samples ranged from 9 to 37, while 20 to 27 phyla have been observed in five surface water samples collected from other areas of Beijing<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="Wei, Y. M. et al. Bacterial communities of Beijing surface waters as revealed by 454 pyrosequencing of the 16S rRNA gene. Environ Sci Pollut Res 22, 12605–12614 (2015)." href="/articles/s41598-018-31706-w#ref-CR6" id="ref-link-section-d86176811e2972">6</a></sup>. These results suggest that the bacterial community composition of Beijing surface waters was significantly different from each other. The dominant phyla also differed among the 16 surface water samples. Proteobacteria (21–53%) and Bacteroidetes (11–64%) were the dominant phyla, which is in agreement with the findings of Bai <i>et al</i>.<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 10" title="Bai, Y. H., Qi, W. X., Liang, J. S. &amp; Qu, J. H. Using high-throughput sequencing to assess the impacts of treated and untreated wastewater discharge on prokaryotic communities in an urban river. Appl Microbiol Biotechnol 98(4), 1841–1851 (2014)." href="/articles/s41598-018-31706-w#ref-CR10" id="ref-link-section-d86176811e2979">10</a></sup>, who examined the bacterial community structures in wastewater treatment bioreactors via high-throughput sequencing. However, Actinobacteria (41.17% of total sequences) and Proteobacteria (31.80%) were the dominant phyla in the Ganjiang River basin<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="Wang, P., Chen, B., Yuan, R. Q., Li, C. Q. &amp; Li, Y. Characteristics of aquatic bacterial community and the influencing factors in an urban river. Sci Total Environ 569-570, 382–389 (2016)." href="/articles/s41598-018-31706-w#ref-CR11" id="ref-link-section-d86176811e2983">11</a></sup>, similar results have been found in other Beijing urban surface water bodies<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="Wei, Y. M. et al. Bacterial communities of Beijing surface waters as revealed by 454 pyrosequencing of the 16S rRNA gene. Environ Sci Pollut Res 22, 12605–12614 (2015)." href="/articles/s41598-018-31706-w#ref-CR6" id="ref-link-section-d86176811e2988">6</a></sup>.</p><p>In previous studies, the factors that could influence the bacterial community in surface water were well understood. For example, the bacterial community composition in the Danube River was determined by denaturing gradient gel electrophoresis analysis, and results indicated its shifts were related to changes in environmental conditions<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 12" title="Winter, C., Hein, T., Kavka, G., Mach, R. L. &amp; Farnleitner, A. H. Longitudinal changes in the bacterial community composition of the Danube River: a whole-river approach. Appl Environ Microb 73, 421–431 (2007)." href="/articles/s41598-018-31706-w#ref-CR12" id="ref-link-section-d86176811e2995">12</a></sup>. In 2015, Zhong <i>et al</i>. reported that the composition and diversity of the prokaryotic communities were significantly related to the concentrations of salinity in lakes of the Tibetan Plateau<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 13" title="Zhong, Z. P. et al. Prokaryotic community structure driven by salinity and ionic concentrations in Plateau lakes of the Tibetan Plateau. Appl Environ Microbiol 82, 1846–1858 (2016)." href="/articles/s41598-018-31706-w#ref-CR13" id="ref-link-section-d86176811e3002">13</a></sup>. Recently, Ibekwe <i>et al</i>. reported that microbial community structure of an urban river was significantly shaped by several key physical and chemical variables for water, including NO<sub>2</sub>, pH, and NO<sub>3</sub><sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 14" title="Ibekwe, A. M., Ma, J. &amp; Murinda, S. E. Bacterial community composition and structure in an Urban River impacted by different pollutant sources. Sci Total Environ 566–567, 1176–1185 (2016)." href="/articles/s41598-018-31706-w#ref-CR14" id="ref-link-section-d86176811e3013">14</a></sup>. Temperature was found to be the most influential factor in determining bacterial community composition of Ganjiang River<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="Wang, P., Chen, B., Yuan, R. Q., Li, C. Q. &amp; Li, Y. Characteristics of aquatic bacterial community and the influencing factors in an urban river. Sci Total Environ 569-570, 382–389 (2016)." href="/articles/s41598-018-31706-w#ref-CR11" id="ref-link-section-d86176811e3017">11</a></sup>. In contrast to these studies, we found turbidity significantly affected bacterial community. This may be because the 16 water samples showed a slightly different turbidity.</p><p>In many countries, especially in the developing world, surface waters are severely contaminated with pathogens leading to various waterborne disease outbreaks<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 15" title="Patel, C. B., Shanker, R., Gupta, V. K. &amp; Upadhyay, R. S. Q-PCR based culture-independent enumeration and detection of Enterobacter: An emerging environmental human pathogen in riverine systems and potable water. Front Microbiol 7, 172 (2016)." href="/articles/s41598-018-31706-w#ref-CR15" id="ref-link-section-d86176811e3024">15</a></sup>. However, few studies concerning waterborne pathogens in urban surface waters have utilized high throughput sequencing. In the present study, it was found that potentially pathogenic bacteria were ubiquitous across all of the sampled surface waters. Among the potential waterborne pathogens, <i>Pseudomonas</i> spp. were the most prevalent at all sites; followed by <i>Aeromonas</i>. Several other potentially pathogenic genera, such as <i>Arcobacter</i>, <i>Legionella</i>, <i>Enterobacter</i>, <i>Bacillus</i>, <i>Serratia</i>, <i>Enterococcus</i>, <i>Mycobacterium</i>, <i>Leptospira</i>, <i>Stenotrophomonas</i>, <i>Clostridium</i>, <i>Mycoplasma</i>, <i>Corynebacterium</i> and <i>Neisseria</i> were also detected in various samples. Examples of how potentially pathogenic these organisms include the following examples: Between 2007 and 2009, 21% of the waterborne outbreaks caused by bacteria was reported in the United States, the leading etiologic pathogen bacteria including <i>E. coli</i> O157: H7, <i>Shigella sonnei</i>, <i>Pseudomona</i>s spp., and <i>Legionella</i> spp<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 16" title="Hlavsa, M. C. et al. Surveillance for waterborne disease outbreaks and other health events associated with recreational water-United States, 2007–08. MMWR Surveill Summ 60, 1–32 (2011)." href="/articles/s41598-018-31706-w#ref-CR16" id="ref-link-section-d86176811e3088">16</a></sup>. Among species of <i>Legionella</i>, a majority are considered pathogenic, with <i>L. pneumophila</i> the leading cause of severe pneumonia worldwide<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 17" title="Berjeaud, J. M. et al. Legionella pneumophila: The paradox of a highly sensitive opportunistic waterborne pathogen able to persist in the environment. Front Microbiol 7, 486 (2016)." href="/articles/s41598-018-31706-w#ref-CR17" id="ref-link-section-d86176811e3099">17</a></sup>. Members of the <i>Aeromonas</i> genus are common aquatic microorganisms and a number of them have been associated with human diseases<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 18" title="Pianetti, A. et al. Determination of the viability of Aeromonas hydrophila in different types of water by flow cytometry, and comparison with classical methods. Appl Environ Microbiol 71, 7948–7954 (2005)." href="/articles/s41598-018-31706-w#ref-CR18" id="ref-link-section-d86176811e3106">18</a></sup>. Several species of <i>Mycobacteria</i> are also pathogenic to humans or animals, causing pulmonary and cutaneous disease, lymphadenitis, and disseminated infections, especially in the growing immunodeficient population<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 19" title="Le Dantec, C. et al. Occurrence of Mycobacteria in water treatment lines and in water distribution systems. Appl Environ Microbiol 68, 5318–5325 (2002)." href="/articles/s41598-018-31706-w#ref-CR19" id="ref-link-section-d86176811e3113">19</a></sup>. In addition, three waterborne outbreaks associated with <i>Arcobacter</i> have been previously reported<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 20" title="Collado, L. et al. Occurrence and diversity of Arcobacter spp. along the Llobregat River catchment, at sewage effluents and in a drinking water treatment plant. Water Res 44, 3696–3702 (2010)." href="/articles/s41598-018-31706-w#ref-CR20" id="ref-link-section-d86176811e3121">20</a></sup>.</p><p>It should be noted that both AN and TN correlated strongly with the percent of total potential pathogens (<i>p</i> ≤ 0.05), and potentially pathogenic bacteria were present at relatively high concentrations in samples QR (10.39%), HL (5.33%) and QL (3.85%). As the short reads generated by Illumina MiSeq platform cannot be accurately classified to the species level nor can they provide information on the amount of total or viable cells in the water samples. This limitation can lead to overestimation of the abundance of potential pathogens. Even so, more attention should be paid to health risks from surface waters in urban areas.</p></div></div></section><section data-title="Conclusion"><div class="c-article-section" id="Sec8-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec8">Conclusion</h2><div class="c-article-section__content" id="Sec8-content"><p>In conclusion, microbial community characteristics of 16 surface water samples in the Beijing area were studied using 16S rRNA gene amplicon sequencing. Bacteroidetes, Proteobacteria and Actinobacteria were the predominant phyla across all the samples. Principal coordinate analysis indicated significant differences in surface water bacterial community composition. Meanwhile, our results demonstrated the presence of potential waterborne pathogens in all of the surface waters sampled and that <i>Pseudomonas</i> spp. are ubiquitous bacteria in a wide variety of surface waters. Spearman correlation analysis showed a positive correlation between water quality properties (AN and TN) and total percent of the potential bacterial pathogens. These results give a better understanding of the urban surface waters ecology.</p></div></div></section><section data-title="Materials and Methods"><div class="c-article-section" id="Sec9-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec9">Materials and Methods</h2><div class="c-article-section__content" id="Sec9-content"><h3 class="c-article__sub-heading" id="Sec10">Study areas and sample collection</h3><p>From March 26<sup>th</sup> to April 17<sup>th</sup> in 2014, samples from the 0–15 cm depth were taken from the lakes, rivers, or reservoir banks using ethanol-disinfected core tubes and stored in sterile Nalgene sampling bottles at 4 °C until processed within 24 h. These 16 surface waters are distributed across Beijing and consequently are located in different districts (Fig. <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/articles/s41598-018-31706-w#Fig6">6</a>), i.e., Bajia country park (BJ), Qing river (QR), Zhongguancun forest park (ZGC), Wenyu river (WY), Rome lake (RM), Huairou reservoir (HR), Hongluo lake (HL), Yanxi lake (YX), Qinglong lake (QL), Miyun reservoir (MY), Yongding river (YD), Gaobeidian reservoir (GBD), Chongqing reservoir (CQ), Niantan reservoir (NT), Nanhucheng river (NH) and Qianhai park (QH). All samples were collected in triplicate and then combined to create a composite sample. The temperature (Temp), electrical conductivity (EC) and pH of the samples were determined on-site using a Multi-parameter water quality meter (YSI, USA). Other analyses included assessment of turbidity, chloride, nitrate, ammonia nitrogen, total phosphorus, and total nitrogen were performed according to Chinese national standards (GB: 5749-2006) by Beijing ZKLH Analyzing &amp; Testing Center (Beijing, China). For determination of total bacterial count, microbial biomass was harvested from approximately volume water samples using 0.45 µm polycarbonate membranes by means of a hand-operated pump, and then placed on aerobic count chromogenic plate (Qingdao Hope Bio-Technology Co., Ltd., Shandong, China). Typical colonies were counted and results expressed as colony forming units (CFU) ml<sup>−1</sup> after incubated at 37 °C for 48 h. The experiment was repeated in triplicate.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-6" data-title="Figure 6"><figure><figcaption><b id="Fig6" class="c-article-section__figure-caption" data-test="figure-caption-text">Figure 6</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/6" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig6_HTML.png?as=webp"><img aria-describedby="Fig6" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1038%2Fs41598-018-31706-w/MediaObjects/41598_2018_31706_Fig6_HTML.png" alt="figure 6" loading="lazy" width="685" height="463"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-6-desc"><p>Map of sampling site locations in the Beijing city. The map was generated using Esri ArcGIS v10.1 (Redlands, CA).</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/articles/s41598-018-31706-w/figures/6" data-track-dest="link:Figure6 Full size image" aria-label="Full size image figure 6" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div><h3 class="c-article__sub-heading c-article__sub-heading--divider" id="Sec11">DNA extraction from water samples and sequencing</h3><p>Total bacterial DNA was extracted from suitable volumes of water samples from each site using Power Soil and Water DNA kits (MO BIO, Inc., Solana Beach, CA), according to the manufacturer’s protocol. The quality and quantity of the isolated nucleic acids were determined using the Nanodrop ND1000 (NanoDrop Technologies, Delaware, USA) and adjusted to 20–30 ng/µL with sterilized ultra-pure water. The V4-V5 regions of the bacterial 16S rRNA gene were amplified by PCR using primers 515F (5′-GTGCCAGCMGCCGCGG-3′) and 907R (5′- CCGTCAATTCMTTTRAGTTT-3′). PCR reactions were performed using 50 μL mixtures containing 5 μL of 10× PCR Buffer, 4 μL of 2.5 mM dNTPs, 1.5 μL of each primer (5 μM), 0.5 μL of <i>Taq</i> DNA polymerase, and 1 μL of template DNA, and sterilized ultrapure water to bring volume up to 50 μL. A negative control containing all reagents except the template DNA was included with each set of reaction mixtures. PCR conditions were as follows: initial denaturation at 94 °C for 5 min; followed by 35 cycles of 94 °C for 30 s, annealing at 52 °C for 30 s, and extension at 72 °C for 1 min; and a final extension at 72 °C for 10 min. PCR products were extracted from 1% agarose gels and purified using the AxyPrep DNA Gel Extraction Kit (Axygen Biosciences, USA) according to the manufacturer’s instructions and quantified using QuantiFluor<sup>TM</sup>-ST (Promega, USA). All PCR products were sequenced using the Illumina MiSeq platform by the Shanghai Majorbio Bio-pharmTechnology Co., Ltd., China.</p><h3 class="c-article__sub-heading c-article__sub-heading--divider" id="Sec12">Data analysis</h3><p>Sequences obtained from the Illumina sequencing platform were strictly filtered to obtained clean data and each sample was split by Qiime (V1.7.0, <a href="http://qiime.org/index.html">http://qiime.org/index.html</a>). Low quality sequences were identified by denoising and filtered out of the dataset. The data generated by Illumina MiSeq was analyzed using the quantitative insights into microbial ecology (QIIME 1.7) toolkit<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 21" title="Caporaso, J. G. et al. Ultra-high-throughput microbial community analysis on the Illumina HiSeq and MiSeq platforms. ISME J 6, 1621–1624 (2012)." href="/articles/s41598-018-31706-w#ref-CR21" id="ref-link-section-d86176811e3208">21</a></sup>. Chimeric sequences were removed using the Uchime function with the sequence collection as its own database in the Mothur program. The effective sequences were then clustered into operational taxonomic units (OTU) at 97% sequence similarity with standard UCLUST method<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 22" title="Edgar, R. C. Search and clustering orders of magnitude faster than BLAST. Bioinformatics 26, 2460–2461 (2010)." href="/articles/s41598-018-31706-w#ref-CR22" id="ref-link-section-d86176811e3212">22</a></sup>. Finally, the RDP classifier was used to assign representative sequence to the microbial taxa<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 23" title="Wang, Q., Garrity, G. M., Tiedje, J. M. &amp; Cole, J. R. Naive Bayesian classifier for rapid assignment of rRNA sequences into the new bacterial taxonomy. Appl Environ Microbiol 73, 5261–5267 (2007)." href="/articles/s41598-018-31706-w#ref-CR23" id="ref-link-section-d86176811e3216">23</a></sup>. Phylogenetic trees were then built from all representative sequences using the FASTTREE algorithm<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 24" title="Price, M. N., Dehal, P. S. &amp; Arkin, A. P. FastTree: computing large minimum evolution trees with profiles instead of a distance matrix. Mol Biol Evol 26, 1641–1650 (2009)." href="/articles/s41598-018-31706-w#ref-CR24" id="ref-link-section-d86176811e3220">24</a></sup>. Heatmaps were drawn using gplots<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 25" title="Warnes, G.R. et al. gplots: Various R Programming Tools for Plotting Data R package version 301. https://CRANR-projectorg/package=gplots. (2015)." href="/articles/s41598-018-31706-w#ref-CR25" id="ref-link-section-d86176811e3225">25</a></sup> in R. The differences in overall community composition between each pair of samples were determined using the weighted and unweighted UNIFRAC metric<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 26" title="Lozupone, C. &amp; Knight, R. UniFrac: a new phylogenetic method for comparing microbial communities. Appl Environ Microbiol 71, 8228–8235 (2005)." href="/articles/s41598-018-31706-w#ref-CR26" id="ref-link-section-d86176811e3229">26</a></sup>. For the statistical analysis, we used a randomly selected subset of 17,519 sequences per water sample to compare relative differences between samples. Normalized libraries were used to calculate the rarefaction curves and phylogenetic diversity. Rarefaction curves are a result of repeated randomizations of the observed species accumulation curve, allowing the observed richness to be compared among samples<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 27" title="Hughes, T. R. et al. Expression profiling using microarrays fabricated by an ink-jet oligonucleotide synthesizer. Nat Biotechnol 19, 342–347 (2001)." href="/articles/s41598-018-31706-w#ref-CR27" id="ref-link-section-d86176811e3233">27</a></sup>. The Good’s coverage estimator was used to estimate the percent of the total species represented in a sample. Canonical correspondence analysis (CCA) was used to evaluate the relationship between the bacterial diversity revealed by pyrosequencing of 16S rRNA genes and water properties. The data of total bacteria was standardized using ln (CFU/mL) transformed before the analysis. CCA were performed using R (2.14.0, <a href="http://www.r-project.org/">http://www.r-project.org/</a>) with the community ecology package “vegan (2.0-4)”<sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 28" title="Oksanen, J. Multivariate analysis of ecological communities in R: vegan tutorial R package version 20-1 (2011)." href="/articles/s41598-018-31706-w#ref-CR28" id="ref-link-section-d86176811e3244">28</a></sup>. Spearman correlation was applied to identify the associations between water parameters and the percent of total potential pathogens, <i>p</i>-values &lt; 0.05 were considered significant.</p><h3 class="c-article__sub-heading c-article__sub-heading--divider" id="Sec13">Nucleotide sequence accession numbers</h3><p>The sequences obtained in this study are available in the NCBI Nucleotide Archive database under project identification numbers SRR5405060-62, SRR5405064-65, SRR5405069-70, SRR5405072-75, SRR5420965-68 and SRR5429450.</p></div></div></section> </div> <div> <div id="MagazineFulltextArticleBodySuffix"><section aria-labelledby="Bib1" data-title="References"><div class="c-article-section" id="Bib1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Bib1">References</h2><div class="c-article-section__content" id="Bib1-content"><div data-container-section="references"><ol class="c-article-references" data-track-component="outbound reference" data-track-context="references section"><li class="c-article-references__item js-c-reading-companion-references-item" data-counter="1."><p class="c-article-references__text" id="ref-CR1">Wu, C. <i>et al</i>. 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Multivariate analysis of ecological communities in R: vegan tutorial R package version 20-1 (2011).</p></li></ol><p class="c-article-references__download u-hide-print"><a data-track="click" data-track-action="download citation references" data-track-label="link" rel="nofollow" href="https://citation-needed.springer.com/v2/references/10.1038/s41598-018-31706-w?format=refman&amp;flavour=references">Download references<svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-download-medium"></use></svg></a></p></div></div></div></section></div><section data-title="Acknowledgements"><div class="c-article-section" id="Ack1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Ack1">Acknowledgements</h2><div class="c-article-section__content" id="Ack1-content"><p>This study was financially supported by the National Natural Science Foundation of China (Nos 31500083, 31570494 and 41561096), the National Water Pollution Control and Treatment Science and Technology Major Project (Nos 2014ZX07204-005 and 2015ZX07206-006).</p></div></div></section><section aria-labelledby="author-information" data-title="Author information"><div class="c-article-section" id="author-information-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="author-information">Author information</h2><div class="c-article-section__content" id="author-information-content"><h3 class="c-article__sub-heading" id="affiliations">Authors and Affiliations</h3><ol class="c-article-author-affiliation__list"><li id="Aff1"><p class="c-article-author-affiliation__address">Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China</p><p class="c-article-author-affiliation__authors-list">Decai Jin, Xiao Kong, Bingjian Cui &amp; Ye Deng</p></li><li id="Aff2"><p class="c-article-author-affiliation__address">College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China</p><p class="c-article-author-affiliation__authors-list">Decai Jin, Xiao Kong, Bingjian Cui &amp; Ye Deng</p></li><li id="Aff3"><p class="c-article-author-affiliation__address">School of History Geography and Tourism, Shangrao Normal University, Shangrao, 334000, China</p><p class="c-article-author-affiliation__authors-list">Shulan Jin</p></li><li id="Aff4"><p class="c-article-author-affiliation__address">State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China</p><p class="c-article-author-affiliation__authors-list">Yunfeng Xie &amp; Xingrun Wang</p></li></ol><div class="u-js-hide u-hide-print" data-test="author-info"><span class="c-article__sub-heading">Authors</span><ol class="c-article-authors-search u-list-reset"><li id="auth-Decai-Jin-Aff1-Aff2"><span class="c-article-authors-search__title u-h3 js-search-name">Decai Jin</span><div class="c-article-authors-search__list"><div class="c-article-authors-search__item c-article-authors-search__list-item--left"><a href="/search?author=Decai%20Jin" class="c-article-button" data-track="click" data-track-action="author link - 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D.C.J. wrote the manuscript. Y.D. and D.C.J. designed the experiment. All the authors contributed to the revision of the manuscript and approved the version to be published.</p><h3 class="c-article__sub-heading" id="corresponding-author">Corresponding authors</h3><p id="corresponding-author-list">Correspondence to <a id="corresp-c1" href="mailto:dcjin@rcees.ac.cn">Decai Jin</a> or <a id="corresp-c2" href="mailto:yedeng@rcees.ac.cn">Ye Deng</a>.</p></div></div></section><section data-title="Ethics declarations"><div class="c-article-section" id="ethics-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="ethics">Ethics declarations</h2><div class="c-article-section__content" id="ethics-content"> <h3 class="c-article__sub-heading" id="FPar1">Competing Interests</h3> <p>The authors declare no competing interests.</p> </div></div></section><section data-title="Additional information"><div class="c-article-section" id="additional-information-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="additional-information">Additional information</h2><div class="c-article-section__content" id="additional-information-content"><p><b>Publisher's note:</b> Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.</p></div></div></section><section data-title="Rights and permissions"><div class="c-article-section" id="rightslink-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="rightslink">Rights and permissions</h2><div class="c-article-section__content" id="rightslink-content"> <p><b>Open Access</b> This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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id="citeas">Cite this article</h3><p class="c-bibliographic-information__citation">Jin, D., Kong, X., Cui, B. <i>et al.</i> Bacterial communities and potential waterborne pathogens within the typical urban surface waters. <i>Sci Rep</i> <b>8</b>, 13368 (2018). https://doi.org/10.1038/s41598-018-31706-w</p><p class="c-bibliographic-information__download-citation u-hide-print"><a data-test="citation-link" data-track="click" data-track-action="download article citation" data-track-label="link" data-track-external="" rel="nofollow" href="https://citation-needed.springer.com/v2/references/10.1038/s41598-018-31706-w?format=refman&amp;flavour=citation">Download citation<svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-download-medium"></use></svg></a></p><ul class="c-bibliographic-information__list" data-test="publication-history"><li class="c-bibliographic-information__list-item"><p>Received<span class="u-hide">: </span><span class="c-bibliographic-information__value"><time datetime="2017-11-28">28 November 2017</time></span></p></li><li class="c-bibliographic-information__list-item"><p>Accepted<span class="u-hide">: </span><span class="c-bibliographic-information__value"><time datetime="2018-05-10">10 May 2018</time></span></p></li><li class="c-bibliographic-information__list-item"><p>Published<span class="u-hide">: </span><span class="c-bibliographic-information__value"><time datetime="2018-09-06">06 September 2018</time></span></p></li><li class="c-bibliographic-information__list-item c-bibliographic-information__list-item--full-width"><p><abbr title="Digital Object Identifier">DOI</abbr><span class="u-hide">: </span><span class="c-bibliographic-information__value">https://doi.org/10.1038/s41598-018-31706-w</span></p></li></ul><div data-component="share-box"><div class="c-article-share-box u-display-none" 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